Is it possible to deploy the frontend (react) in dev mode to act as an ephemeral review app to share with someone else to try it out?

I have a dev.mydomain.com that I promote to prod. It was pretty straightforward to set that up. Is that what you are asking?

@Pablo Fernandez Each ephemeral app can be its own stage. For example, deploying each pr to

prXXXX

where

XXXX

is the pr id. And you can assign a custom domain for each stage as

prXXXX.mydomaincom

as @Devin suggested.